A sharp X-ray absorption feature in the BL Lacertae object PKS 2155-304

Details A sharp X-ray absorption feature in the BL Lacertae object PKS 2155-304 A sharp X-ray absorption feature in the BL Lacertae object PKS 2155-304

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278l..99c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 278, March 15, 1984, p. L99-L102.

Astronomy and Astrophysics

Astrophysics

88

Absorption Spectra, Astronomical Spectroscopy, Bl Lacertae Objects, X Ray Sources, Heao 2, Oxygen Spectra, X Ray Spectra

Scientific paper

An absorption feature appears at 600 eV and extends to higher energies by 50 - 100 eV in a spectrum that covers the range from 0.38 to 1.6 keV obtained with the objective grating spectrometer on the Einstein Observatory. The spectrum can be fitted by a single absorption edge or trough plus two power laws with slopes that are consistent with simultaneous measurements of the 2 - 10 keV flux. The absence of a low-energy cutoff is consistent with a neutral column density of NH I ≡ 4×1020 cm-2. Absorption by ionized oxygen is by far the most likely explanation of the sharp feature, and possible detailed interpretations are discussed.

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